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(ModeL) J. BURMANN.

CALENDAR WATCH. Na, 245,130.- Patented Aug. 2,1881.

WITNESSES: INVENTOR:

ATTORNEYS.

PATENT OFFICE.

JACOT BURMANN, OF BIENNE, SlVlTZERLAND.

CALENDAR-WATCH.

SPECIFICATION forming part of Letters Application filed March .25, 1881.

To all whom it may concern:

Be it known that I, JAGOT BURMANN, of Bienne, Switzerland, have invented a new and Improved Calendar-Watch, of which the following is a specification.

The object of my invention is to provide a new and improved watch provided with devices for indicating the day of the week and month, the month of the year, and the moons phases.

The invention consists in a pointer-hand pivoted on the outside of the back cap of a watch by a pin which passes through the cap into a spring resting on a ratchet-wheel having stars and the moon painted or engraved on the surface resting against the inner surface of the cap, so that the moon will be visible through a semi-lunar slot or aperture in the back cap, which ratchet-wheel is actuated by a pinion, acted upon by a pinion of the works, whereby the pointer-hand will be moved successively to the names of the days of the week and the numerals of the days of the month arranged on circles in the outer surface of the back cap. The names of the month, painted or engraved on an adjustable ring on the in nor surface of the cap, are visible through a segmental slot in the cap, and the phases of the moon are shown in the semi-lunar slot or aperture.

In the accompanying drawings, Figure l is an inside elevation of my improved calendar attachment for watches and of the works of the watch. Fig. 2 is an outside elevation of the back of a watch provided with my improved calendar attachment. Fig. 3 is a cross-sectional elevation of the same on the lines 00 .70 and y y, Figs. 1 and 2 respectively.

Similar letters of reference indicate corresponding parts.

A pointer-hand, A, on the outer surface of the back cap, B, of a watch, 0, is mounted on a central arbor, D, passing through the cap B and into a flat spring, E, resting on a ratchetwheel, F, loosely mounted on the arbor D, and having a moon, 0, and stars painted or engraved on the surface, resting against the inner surface of the cap B, so that this moon and the stars will show through a semi-lunar slot, H, of the cap.

Patent No. 245,130, dated August 2, 1881,

(ModeL) The ratchet-wheel F is actuated by a pinion, I, which, in turn, is actuated by a single tooth, J, of an arbor, K, which is rotated once in twentyfour hours by suitable interposed wheels from the hour-hand arbor of the watch. them the back cap is closed the pinion I passes through an aperture, L, in the cap M covering the works, so that the tooth J can act upon this pinion I. The ratchet-wheel F is prevented from rotating freely by a spring-pawl, N.

The initials of the days of the week, for a month or a few days more, are engraved or painted on a fiat ring, 0, on the outer surface of the cap B, and provided with a bent pin, P, and a rivet, Q, passing through segmental slots R in the {back cap, B, for thepurpose of holding the ring 0 to the cap, and to permit of adjusting the same. The names of the month are engraved or painted on the surface facing the inner surface of the back B of a ring, S, resting in a recess in the cap B, and held in this recess by the flat spring T and the rigid end of the spring-pawl N.

The ring S is provided with teeth in its outer edge to permit of rotating it with the fingers.

The cap B is provided with a segmental slot, V, through which one of the names of the months on the ring S is visible. The numerals of the days of the month are arranged in a circle, within the ring 0, as shown in Fig. 2.

The within-described attachment can be ap plied to any watch, the ordinary time-dial showing on the front of the watch and the calendar-dial on the rear.

The operation is as follows On the first of the month the ring S is so adjusted that the name of the corresponding month will show through the slot V. The ring 0 is then so adjusted that the initial of the day of the first of the month will be adjoining the numeral 1 of the circle W of numerals of the days of the month. The wheel F is then turned more or less, according to the phase of the moon, which will show accordingly through the semi-lunar slot H, and the pointer-hand A is turned until it points to the numeral 1. As the arbor K rotates once in twenty-four hours the wheel F will be rotated the distance of one tooth in the same time, and the hand A will be moved the distance from one initial on the ring 0 to the next one. The friction of the spring E on the wheel F causes the hand to move with the wheel, but when this friction is overcome the hand can be moved independently to permit 5 of adjusting it.

Having thus fully described my invention, 1 claim as new and desire to secure by Letters Patent 1. A calendar attachment for watches, made to substantially as herein shown and described, and consisting of a pointer-hand pivoted on the back cap provided with the names of the months, the initials of the days of the week, and the numerals of the days of the month, in I 5 combination with a ratchet-wheel on the arbor of the pointer-hand, a pinion engaging there with, and mechanism in the works of the watch for rotating this pinion, as set forth.

2. In a calendar attachment for watches, the combination, with the back cap, B, of a watch, 20 of the arbor D, the hand A, the ratchet-wheel F, loosely mounted on this arbor, and the spring E, attached to the inner end of this arbor and resting on the wheel F, substantially as herein shown and described, and for the 25 purpose set forth.

JAGO'l BURMANN.

Witnesses:

TH. FRUER, ELMER ScHMiD. 

